Drive-control mechanism



oct. 20,1925. 1.557,999

B. B. FARNHAM DRIVE CONTROL MECHANI SM Filed March 22, 1924 3 Sheets-Sheet 1 l gy/.Z1 1 w/f C- f if] --.Qq QZ? 51 1,//20

I `l l /j /1 J /g j Oct. 20,1925

, 1,557,999 B. B. FARNHAM nnlvs CONTROL Mcamrsu 3 Sheets-Sheet 2 Filed March 22, 1924 v B. B. FARNHAM DRIVE CONTROL MmCHANIsu Filed March 22, 1924 25 Sheets-Sheet 3 Patented Oct. 20, 1925. l' l UNITED STATES lParizlv'r ort-fics.

BION B. FARNHAM, OF BUFFALO, NEW YORK.

DRIVE-CONTROL MECHANISM.

Application filed March 22, 1924. Serial No. l701,120.

To all whom t may concern.' Fig. 4 is a vertical transverse section 55 Be it known that I, BroN B. FARNHAM, through the gear housing and the parts a citizen lof the United States, residing at therein. Buffalo, in the kcounty of Erie and State Of Fig. is a side elevation of the gearing, 5 New York, have invented anew and useful a portion of the removable head of the hous- Drive-Control Mechanism, of which the foling being removed, the gears being shown 60 lowing is a specification. in one position.

This invention relatesto drive mechanism Fig. 6 is a view similar to Fig. 5 showing designed primarily yfor use in connection the gears shifted to another position rela- With paper making machines. In machines tive to each other. of this character Where it is necesary to Referring to the figures by characters of 65 drive a long web or belt, it has been a difhreference 1 designates a base provided With cult matter to so control a drive as to prestandards 2 and 3 in which is mounted a vent the Web from stretching and breaking drive shaft 4 provided With a drive pulley 15 the sheet of stock carried by it. Various 5. A driven shaft G may be extended means, such as conical friction drives, as through the base and has a gear 7 meshing 70 shown for example in Patent No. 676,492, With another gear 8 secured to and rotatable have been devised for overcoming the difliwith a shaft 9. This shaft is journaled in j oulties encountered in apparatus of this the standard 2 and in a bearing 10 and type but owing to the absence of any alines with another shaft 11 journaled in the minutely variable automatic adjustment, the standard 3 and bearing 12. A pulley 13 is 75 faults have not been entirely eliminated. secured to shaft 11 and is adapted to receive It is an object of the present invention to motion through a belt 14 from the pulley 5. provide a drive mechanism which, after A housing 15 is mounted for rotation on being adjusted to the load or pull of the one end portion of the shaft 9 and has a predetermined amount or degree, Will yield head or cover plate 16 secured thereto from 80 automatically to prevent undesirable distorwhich is extended a flange 17 provided tion of the web and will pick up automati With an arcuate slot 18. In this slot is adcally When any variations have been rec` justably secured a stud 19 carrying an idler tiied. pulley 2O which engages plate 14 at a point A further object is to provide a drive between the pulleys 5 and 13. An arm 21 35 mechanism of this character which is simple, is extended radially from the housing 15 compact and eflicient and will not readily and carries an adjustable Weight 22 so that get out of order. 4 the housing can be rotated in one direction With the foregoing and other objects in unless Weight 22 is lifted and pulley 20 view which Will appear as the description moved away from the engaged portion of 90 proceeds, the invention resides in the combithe belt 14. nation and arrangement of parts and in the Secured .to the shaft 9 so as to rotate details of construction hereafter described Within the housing 15 is an internal gear 40 and claimed, it being understood that 23 meshing With a gear 24 mounted for rochanges in the precise embodiment of the "tation on the stud 25 extending inwardly 95 invention herein disclosed may be made from the cover plate or head 16 of the hous- Within the scope of What is claimed Without ing 15. This gear 24 in turn, meshes With departing from the spirit of the invention.V a gear 26 secured to the end of shaft 11.

In the accompanying drawings the pre- From the foregoing it Will be apparent ferred form of the invention has been that under ordinary conditions the rotation 100 shown. of pulley 13 by the belt 14 Will result in the In said drawingstransmission of motion through gears 26,

Figure 1 is a front elevation of the 24 and 23 to the shaft 9 with the result that mechanism constituting the present invenmotion will be transmitted through gears 8 tion. and 9 to the shaft G. When the shaft 6 is 105 Fig. 2 is a side elevation thereof. subjected to excessive resistance or load Fig. 3 is a. section on line 3-3, Fig. 1, however, the rotation of the gear 23 Will be showing a portion of the mechanism. retarded and this Will result 1n gear 24 traveling along gear 23 t-o the position such as shown, for example, in Fig. 6. Consequently the housing l5 will be swung about its center with gear 2li because of the stud connection 25 between said gear and the housing. This will result in the weight 22 being lifted o-ut of normal position and the pulley 20 being shifted so as to loosen belt 14: and either partly or entirely stop the transmission of motion from pulley 5 to pulley 13. Obviously, therefore, by a proper adjustment of the parts any excessive strain or load upon the transmission mechanism will result in the automatic slowing down or stopping of the drive connection between the pulleys 5 and 13 so that should the web of the n'iechanism to which the drive is connected be drawn too taut and endanger rupturing of the paper thereby, the further transmission of motion through the d 1ive would be automatically slowed down or stopped until the web has had a chance to bc relieved of the strain to which it has been subjected.

lhile this mechanism is designed primarily for use in connection with paper making machinery, it is to be understood that it can be used efficiently wherever an automatic load cont-rolled drive is desirable.

For the purpose of retarding the downward moi/'ement of the uf'eighted arm 2l a dash pot structure indicated generally at 27 in Fig. 2 may be connected to the arin. As this dash pot constitutes no part of the present invention it has not been thought necessary to show or describe the same in detail.

What is claimed is l. In a mechanism of the class described, the combination with alining shafts, spaced pulleys one of which is secured to one of the shafts, and a belt connecting the pulleys, of driven mechanism connected to the othel` shaft, a weighted rotatable housing mounted upon one of the shafts, an idler movable with the housing and engaging the belt to hold it normally taut, an annular gear rotatable with one of the shafts, an intermediate gear meshing therewith and movable with the housing, and a gear upon the other shaft meshing with the intermediate gear.

Q. rl`he combination with spaced pulleys and a drive belt connecting the same, of alining shafts, one of said shafts being connected to one of the pulleys, an annular gear rotatable with the other shaft, a rotatable housing mounted freely on the gear shaft, an idler carried by the housing, of gravity operated means carried by the housing for holding the idler normally pressed against the belt. to maintain the be t taut, a gear rotatable with the pulley shaft, and an intermediate gear carried by the hous ing and meshing with the annular gear and the gear upon the pulley shaft.

in testimony that l claim the foregoing as my own, l have hereto affixed my signature.

BION B. FARNHAM. 

